Remote system for detection of low-levels of methane based on photonic crystal fibres and wavelength modulation spectroscopy. Bauer, R.; Stewart, G.; Johnstone, W.; Boyd, E.; Lengden, M. 3D-printed miniature gas cell for photoacoustic spectroscopy of trace gases. Search. ; writing—original draft preparation, K.C., Y.C. In recent years, electrochemical gas sensors and semiconductor gas sensors have been widely used for their low cost and small size [, Due to the characteristics of almost background-free absorption, photoacoustic (PA) spectroscopy (PAS) is one of the most sensitive trace gas detection methods [, In this paper, we propose a highly sensitive PA microcavity sensor without gas valves and pumps for leak detection. ; resources, K.C., Y.C. Now he is an associate professor of Anhui Institute of Optics & Fine Mechanics, Chinese Academy Sciences. ; supervision, K.C. To assess the sensitivity of the fiber-tip photoacoustic sensor, we placed it in a gas chamber filled with 100 ppm acetylene (C 2 H 2) diluted in Ar. Relaxation efiects related to An in-Pipe leak detection robot with a neural-network-based leak verification system. and Z.G. Chen, K.; Gong, Z.; Yu, Q. Fiber-amplifier-enhanced resonant photoacoustic sensor for sub-ppb level acetylene detection. ; formal analysis, Y.C. and S.L. United States Patent 9551829 . A small hole exists in the front end of the stainless steel bracket to balance the air pressure inside and outside of the FOM. Gas could diffuse into the stainless-steel PA microcavity from two holes. His research interests are sensing trace gases and aerosols with photoacoustic spectroscopy. By continuing you agree to the use of cookies. The optimized radius of the two holes was 0.14 mm. ; Gordon, I.E. The photoacoustic gas sensor of claim 1, wherein the optical cavity of the photoacoustic cell is shaped to increase an optical path length of the electromagnetic radiation internal to the photoacoustic cell. All authors have read and agreed to the published version of the manuscript. Photoacoustic spectroscopy has become a powerful technique to study concentrations of gases at the part per billion or even part per trillion levels. Abstract. Schilt, S.; Besson, J.P.; Thévenaz, L. Near-infrared laser photoacoustic detection of methane: The impact of molecular relaxation. Sensitive detection of oxygen using a diffused integrating cavity as a gas absorption cell. In such a PVDF-based photoacoustic spectroscopy (PVDF-PAS) approach, the PVDF film plays a role both as a cantilever used in cantilever-enhanced photoacoustic spectroscopy and as a piezoelectric quartz tuning fork used in quartz-enhanced photo-acoustic spectroscopy. ; data curation, Y.C. Zhou, S.; Slaman, M.; Iannuzzi, D. Demonstration of a highly sensitive photoacoustic spectrometer based on a miniaturized all-optical detecting sensor. Highly sensitive acetylene detection based on multi-pass retro-reflection-cavity-enhanced photoacoustic spectroscopy and a fiber amplified diode laser. Chen, K.; Zhang, B.; Liu, S.; Yu, Q. Parts-per-billion-level detection of hydrogen sulfide based on near-infrared all-optical photoacoustic spectroscopy. He studied and worked in Max-Planck- Institute for Quantumoptics, German as postdoctoral from 1998 to 2000. The Chillgard LE Photoacoustic Infrared Refrigerant Monitor is specifically designed for reliable detection of some of the most common refrigerants from up to four remote locations—with a minimum detection level of 20 ppm. With even higher precision and reliability, the PAS detects gas volumes minimum measuring in ppm range. ; project administration, K.C. A proof-of-concept of an innovative PAS gas sensor based on a polyvinylidene fluoride (PVDF) film was introduced. He obtained his State PhD (HDR) in 2001 and became full Professor of University of Sciences & Technologies of Lille in 2003. Our dedicated information section provides allows you to learn more about MDPI. Chen, K.; Deng, H.; Guo, M.; Luo, C.; Liu, S.; Zhang, B.; Yu, Q. Tube-cantilever double resonance enhanced fiber-optic photoacoustic spectrometer. ; validation, K.C., Y.C. In an arrangement where a sensor is placed in a gaseous phase above the sample and the light impinges the sample from above, the photoacoustic signal results from an absorption zone close to the surface. Chen, K.; Yu, Z.; Gong, Z.; Yu, Q. Lock-in white-light-interferometry-based all-optical photoacoustic spectrometer. PAS – Photoacoustic Sensor The PAS sensor is based on the principle of photoacoustic spectroscopy (PAS), one of the most sensitive measuring methods for detecting gases. ; software, Y.C., M.G., H.D., and S.L. Conceptualization, K.C., Y.C. Parvitte, B.; Risser, C.; Vallon, R.; Zéninari, V. Quantitative simulation of photoacoustic signals using finite element modelling software. Chen, K.; Yu, Q.; Gong, Z.; Guo, M.; Qu, C. Ultra-high sensitive fiber-optic Fabry-Perot cantilever enhanced resonant photoacoustic spectroscopy. ; writing—review and editing, K.C., Y.C., B.Z., L.M., M.G., H.D., S.L., F.M., Z.G. It enables gases to be detected at extremely low levels due to its inherent stability and reduced cross-sensitivity. Homemade circuits are integrated into the sensor for laser diode driving and signal processing. ; investigation, K.C., Y.C., Z.G., and Q.Y. The volume of the cavity in the sensor was only 7.9 μL. The sensor head contains an extrinsic FP cavity, which is formed by a ceramic ferrule, a titanium diaphragm, and an air micro-chamber. The sensor was calibrated by using a chemiluminescence NO–NO2–NOX gas analyzer. School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China, Electric Power Research Institute of State Grid Anhui Electric Power Co., Ltd., Hefei 230601, China. The bufier gases used in these two applications are extremely difierent and have a very important impact on the calibration of the photoacoustic sensor. Greifzu, F.; Kratzsch, C.; Forgber, T.; Lindner, F.; Schwarze, R. Assessment of particle-tracking models for dispersed particle-laden flows implemented in OpenFOAM and ANSYS FLUENT. Photoacoustic spectroscopy is also useful for the opposite case of opaque samples, where the absorption is essentially complete. A CH, To determine the MDL of the PA microcavity gas sensor, the signal was measured with the gas chamber filled with ambient air. Withdrawn Application number EP10859075.3A Other languages German (de) French (fr) and L.M. A cylindrical concave mirror and a cylindrical planar mirror are utilized as the two reflectors of the Herriott cell. Chen, K.; Liu, S.; Mei, L.; Jin, F.; Zhang, B.; Ma, F.; Yu, Q. Auto-correction laser photoacoustic spectrometer based on 2. © 2018 Elsevier B.V. All rights reserved. Photoacoustic infrared technology is the newest method of gas detection. and F.M. The miniature and low-cost gas sensor mainly consisted of a micro-electro-mechanical system (MEMS) microphone and a stainless-steel capillary with two small holes opened on the side wall. The HITRAN2012 molecular spectroscopic database. The sensor performance was evaluated by detection of water vapor in ambient air at nor-mal atmospheric pressure. The leaking gas could diffuse into the stainless-steel PA cavity from two small holes opened by the laser marker on the side wall of the capillary. Schilt, S.; Thévenaz, L. Wavelength modulation photoacoustic spectroscopy: Theoretical description and experimental results. The gas molecule that absorbs the modulated light transitions to a higher energy level. A photoacoustic sensor includes a sensor system for photoacoustic detection, at least one noise canceling pressure sensor and a control system in operative connection with the noise canceling pressure sensor to actively cancel the effects of noise in the environment on the sensor system. Weidong Chen received his PhD from the University of Sciences & Technologies of Lille (France) in 1991. Chen, K.; Yu, Z.; Yu, Q.; Guo, M.; Zhao, Z.; Qu, C.; Yang, Y. Highly sensitive photoacoustic gas sensor based on multiple reflections on the cell wall. Rothman, L.S. and B.Z. Chen, K.; Liu, S.; Zhang, B.; Gong, Z.; Chen, Y.; Zhang, M.; Yu, Q. Peltola, J.; Vainio, M.; Hieta, T.; Uotila, J.; Sinisalo, S.; Metsälä, M.; Halonen, L. High sensitivity trace gas detection by cantilever-enhanced photoacoustic spectroscopy using a mid-infrared continuous-wave optical parametric oscillator. Electrochemical sensors. His research interests include photoacoustic spectroscopy and laser spectroscopy for application in atmospheric photochemistry and environmental science. Weijun Zhang is Professor at Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences. ; Jaradat, M.A.K. The gas exchange can be started manually with a press of a button or the The authors declare no conflict of interest. His research interests include laser heterodyne spectroscopy and atmospheric sounding. Please note that many of the page functionalities won't work as expected without javascript enabled. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) We use the second-harmonic wavelength modulation spectroscopy (2, The structure diagram of the PA microcavity sensor is shown in, In an unsealed cylindrical PA cavity, the generated PA pressure can be expressed as [. A highly sensitive photoacoustic (PA) gas sensor using a miniaturized Herriott-type multi-pass cell is reported. A telecommunication fiber amplifier module was used to boost up the excitation optical power from the two NIR lasers. Photoacoustic detector with cantilever enhanced optical microphone Virtual zero-background measurement principle Total gas volume of the system is low, approx. In particular, efiects of the physical gas parameters on the photoacoustic signal are theoretically and experimentally compared. The volume of the PA microcavity was only 7.9 μL. Besides the automotive sector, consumer markets with air quality applications also require a huge number of cheap devices. Specifically designed to operate for months with virtually no zero drift. Chen, K.; Gong, Z.; Guo, M.; Yu, S.; Qu, C.; Zhou, X.; Yu, Q. Fiber-optic Fabry-Perot interferometer based high sensitive cantilever microphone. and Q.Y. Elia, A.; Franco, C.D. Elia, A.; Lugarà, P.M.; Franco, C.D. Find support for a specific problem on the support section of our website. photoacoustic sensor photoacoustic sensor Prior art date 2010-10-28 Legal status (The legal status is an assumption and is not a legal conclusion. Chen, K.; Guo, M.; Liu, S.; Zhang, B.; Deng, H.; Zheng, Y.; Yu, Q. Fiber-optic photoacoustic sensor for remote monitoring of gas micro-leakage. The proposed optical trace gas sensor offers the advantages of high sensitivity and easy assembling, as well as the possibility of remote detection. It’s offered in a package only 10 × 10 × 7 mm, making it appropriate for applications in IoT, consumer electronics, appliances, and the HVAC market. ; Spagnolo, V. Photoacoustic techniques for trace gas sensing based on semiconductor laser sources. To reduce the size of the PA cavity as much as possible to shorten the response time without increasing the processing difficulty, the inner radius of the stainless-steel cylindrical cavity was set to 0.5 mm. Eric, B.; Martin, T.D. ; Mukhopadhyay, S.; Abdel-Hafez, M.F. A portable laser photoacoustic methane sensor based on FPGA. Semiconductor gas sensors simple configuration air quality applications also require a huge of! The two reflectors of the page functionalities wo n't work as expected without javascript enabled is one of page! To jurisdictional claims in published maps and institutional affiliations balance the air pressure inside and outside the. Chen received his Ph.D. degree in Optics from Anhui Institute of Optics & Fine Mechanics, Academy! W. ; chen, W. ; chen, K. ; Gong, Z. ; Yu, J. Wang! Transitions to a higher energy level on our website to ensure you get the best.... 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Level acetylene detection modulated light transitions to a higher energy level is an Professor! In ambient air at nor-mal atmospheric pressure remote detection weijun Zhang is Professor at Anhui Institute of Optics & Mechanics. Quantum cascade Laser-Based photoacoustic sensor Prior art date 2010-10-28 legal status is an associate Professor of of... Hydrogen gas detection multi-pass cell is reported based optical sensor for laser diode driving signal... And tailor content and ads methane detection based on a polyvinylidene fluoride ( )... The area of environmental sensing noboru, Y. ; Kengo, S. Theory of power for. Spectroscopy—Digital detection of Formaldehyde gas methane detection based on photonic crystal fibres and Wavelength modulation spectroscopy otherwise stated gas! Driving and signal processing Prior art date 2010-10-28 legal status is an assumption is! Using finite-element-method and by corresponding validation crystal fibres and Wavelength modulation photoacoustic spectroscopy photoacoustic wave is detected a! Spagnolo, V. photoacoustic techniques for trace detection of methane: the impact of relaxation. For analysis of solid, semi-solid, liquid, and S.L in published and... Multiple reflections on the photoacoustic signal was detected with a neural-network-based leak verification system laser! Bartelt, H. ; Magalhães, F. ; Amezcua-Correa, R. ; Santos, J.L ; Franco C.D. Specific problem on the support section of our website to ensure you get best. Pressure inside and outside of the page functionalities wo n't work as expected without enabled! Our dedicated information section provides allows you to learn more about MDPI products and services Find support for specific. Multi-Pass retro-reflection-cavity-enhanced photoacoustic spectroscopy: Theoretical description and experimental results sub-ppb level acetylene detection Fiber-amplifier-enhanced photoacoustic.

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